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in news:web.5c54c166738ba468765e06870@news.povray.org Bald Eagle wrote:
> I guess if you wanted that one-pixel wide strip at the center to use
> the other function, then you'd use the 4-argument version and repeat
> the first function for the u = 0 case.
>
Bill,
on an almost "aside way" you explain me that things can be done simpler
and then ask:
> Hopefully at some point you can share some of your understanding of
> the user-defined camera with a few simple explanatory examples /
> tutorials.
in the land of 'nikked' eagles one feather ain't king ;)
but seriously, I almost exclusivly use the 4 term select as:
select(query, ignore(=-1), true, false)
Regarding the pixel in the middle, where does it belong ??? In case of a
stereo cam, the left or right side of the image, there is no in between?
User defined cameras are great, just starting to explore them, but ...
they are indeed rather under documented. It's hard to understand what
exactly happens, but once I get it I'm willing to do a write up (to be
corrected by the ones that realy understand). An other thing is that they
seem to be "verbose". When I try to reimplement an existing 10 line of c++
code cam it seems I need at least 5 times more space. It requires a lot of
trials and mostley errors as I have a hard time wrapping my brain around
some things and my brain isn't very structured, more intuitive.
User defined cameras are great, just starting to explore them, but ...
Ray tracing is about rays, objects an cameras and I realy think POV-Ray
deserves a whealthy choise of ready made cameras. Paul Bourke has defined
a very nice set of stereo cameras a decade ago that I.M.H.O would be very
welcome in an official distribution. Le Forgeron, as I discovered today,
has made a set of _/incredible and bewildering/_ set of 'planet mapping'
camera's. The https://www.cartographersguild.com would love them (/him for
that), they do not seem to have discovered them yet. Let's not forget
Fabrizio's (Clodi) OSD camera.
ingo
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